The precautionary closure is a result of oil sightings in this general area and the potential impacts on Mississippi's coastal marine resources.

Mississippi's bays and rivers remain open for fishing.

Also Thursday, Doug Suttles, chief operating officer of BP PLC, told coastal officials in Jackson County that tar balls, patties, mousse and other oil residue from the Deepwater Horizon gusher will continue to wash up on the local shoreline for two months after the flow has stopped.

"We know the travel time is about that," he said. "It will still come ashore after that, but in much smaller quantities. We are going to be here as long as it is coming in."

Suttles made a visit Thursday to Pascagoula Beach, a newly created 1.5-mile long beach where about 200 workers hunted for oil debris.

Mike Mangum, president of the Jackson County Board of Supervisors, and Robbie Maxwell, Pascagoula mayor, accompanied Suttles on the beach walk.

"I feel much better after talking with him," said Maxwell. "One of the reasons we had him out here was to look at the beach and understand the beach is eroding and we are preparing to put riprap on it, and how that is going to affect his operations."